Description

An occasional ensure is thrown when opening Camera Anim assets. Generally, the issue occurs when opening the asset for a second time, but the repro rate is low, around 1/5.

Steps to Reproduce
  1. Open a 'Camera Anim' asset
    • One can be created from the 'micellaneous' submenu when right-clicking in the content browser
  2. Open the Output Log
  3. Close Matinee
  4. Continue to open the asset until ensure occurs (low repro 1/5)

Result:
Observe an ensure failure in the logs

Callstack
[2016.08.21-15.49.31:836][589]LogOutputDevice:Error: === Handled ensure: ===
[2016.08.21-15.49.31:837][589]LogOutputDevice:Error: 
[2016.08.21-15.49.31:837][589]LogOutputDevice:Error: Ensure condition failed: AttachParent == nullptr || !AttachParent->AttachChildren.Contains(this) [File:D:\Main\Main_Stream\Engine\Source\Runtime\Engine\Private\Components\SceneComponent.cpp] [Line: 1415]
[2016.08.21-15.49.31:838][589]LogOutputDevice:Error: SetupAttachment cannot be used once a component has already had AttachTo used to connect it to a parent.
[2016.08.21-15.49.31:838][589]LogOutputDevice:Error: Stack: 
[2016.08.21-15.49.31:839][589]LogOutputDevice:Error: UE4Editor-Core.dll!FWindowsPlatformStackWalk::StackWalkAndDump() [d:\main\main_stream\engine\source\runtime\core\private\windows\windowsplatformstackwalk.cpp:183]
[2016.08.21-15.49.31:839][589]LogOutputDevice:Error: UE4Editor-Core.dll!FDebug::EnsureFailed() [d:\main\main_stream\engine\source\runtime\core\private\misc\outputdevice.cpp:297]
[2016.08.21-15.49.31:840][589]LogOutputDevice:Error: UE4Editor-Core.dll!FDebug::OptionallyLogFormattedEnsureMessageReturningFalse() [d:\main\main_stream\engine\source\runtime\core\private\misc\outputdevice.cpp:432]
[2016.08.21-15.49.31:840][589]LogOutputDevice:Error: UE4Editor-Engine.dll!USceneComponent::SetupAttachment() [d:\main\main_stream\engine\source\runtime\engine\private\components\scenecomponent.cpp:1415]
[2016.08.21-15.49.31:841][589]LogOutputDevice:Error: UE4Editor-Engine.dll!AMatineeActor::AMatineeActor() [d:\main\main_stream\engine\source\runtime\engine\private\interpolation.cpp:359]
[2016.08.21-15.49.31:841][589]LogOutputDevice:Error: UE4Editor-Engine.dll!AMatineeActorCameraAnim::AMatineeActorCameraAnim() [d:\main\main_stream\engine\source\runtime\engine\private\interpolation.cpp:1868]
[2016.08.21-15.49.31:842][589]LogOutputDevice:Error: UE4Editor-CoreUObject.dll!StaticConstructObject_Internal() [d:\main\main_stream\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:3149]
[2016.08.21-15.49.31:842][589]LogOutputDevice:Error: UE4Editor-Engine.dll!NewObject<AActor>() [d:\main\main_stream\engine\source\runtime\coreuobject\public\uobject\uobjectglobals.h:1211]
[2016.08.21-15.49.31:843][589]LogOutputDevice:Error: UE4Editor-Engine.dll!UWorld::SpawnActor() [d:\main\main_stream\engine\source\runtime\engine\private\levelactor.cpp:412]
[2016.08.21-15.49.31:843][589]LogOutputDevice:Error: UE4Editor-Engine.dll!UWorld::SpawnActor() [d:\main\main_stream\engine\source\runtime\engine\private\levelactor.cpp:271]
[2016.08.21-15.49.31:844][589]LogOutputDevice:Error: UE4Editor-AssetTools.dll!FAssetTypeActions_CameraAnim::CreateMatineeActorForCameraAnim() [d:\main\main_stream\engine\source\developer\assettools\private\assettypeactions\assettypeactions_cameraanim.cpp:23]
[2016.08.21-15.49.31:844][589]LogOutputDevice:Error: UE4Editor-AssetTools.dll!FAssetTypeActions_CameraAnim::OpenAssetEditor() [d:\main\main_stream\engine\source\developer\assettools\private\assettypeactions\assettypeactions_cameraanim.cpp:182]
[2016.08.21-15.49.31:844][589]LogOutputDevice:Error: UE4Editor-UnrealEd.dll!FAssetEditorManager::OpenEditorForAsset() [d:\main\main_stream\engine\source\editor\unrealed\private\toolkits\asseteditormanager.cpp:338]
[2016.08.21-15.49.31:845][589]LogOutputDevice:Error: UE4Editor-AssetTools.dll!FAssetTypeActions_Base::AssetsActivated() [d:\main\main_stream\engine\source\developer\assettools\public\assettypeactions_base.h:41]
[2016.08.21-15.49.31:845][589]LogOutputDevice:Error: UE4Editor-ContentBrowser.dll!SContentBrowser::OnAssetsActivated() [d:\main\main_stream\engine\source\editor\contentbrowser\private\scontentbrowser.cpp:1813]
[2016.08.21-15.49.31:846][589]LogOutputDevice:Error: UE4Editor-ContentBrowser.dll!TBaseSPMethodDelegateInstance<0,SContentBrowser,0,TTypeWrapper<void> __cdecl(TArray<FAssetData,FDefaultAllocator> const & __ptr64,enum EAssetTypeActivationMethod::Type)>::Execute() [d:\main\main_stream\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:317]
[2016.08.21-15.49.31:846][589]LogOutputDevice:Error: UE4Editor-ContentBrowser.dll!TBaseSPMethodDelegateInstance<0,SContentBrowser,0,void __cdecl(TArray<FAssetData,FDefaultAllocator> const & __ptr64,enum EAssetTypeActivationMethod::Type)>::ExecuteIfSafe() [d:\main\main_stream\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:424]
[2016.08.21-15.49.31:847][589]LogOutputDevice:Error: UE4Editor-ContentBrowser.dll!TBaseDelegate<void,TArray<FAssetData,FDefaultAllocator> const & __ptr64,enum EAssetTypeActivationMethod::Type>::ExecuteIfBound() [d:\main\main_stream\engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:608]
[2016.08.21-15.49.31:848][589]LogOutputDevice:Error: UE4Editor-ContentBrowser.dll!SAssetView::OnListMouseButtonDoubleClick() [d:\main\main_stream\engine\source\editor\contentbrowser\private\sassetview.cpp:3555]
[2016.08.21-15.49.31:848][589]LogOutputDevice:Error: UE4Editor-ContentBrowser.dll!TBaseSPMethodDelegateInstance<0,SAssetView,0,TTypeWrapper<void> __cdecl(TSharedPtr<FAssetViewItem,0>)>::Execute() [d:\main\main_stream\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:317]
[2016.08.21-15.49.31:849][589]LogOutputDevice:Error: UE4Editor-ContentBrowser.dll!TBaseSPMethodDelegateInstance<0,SAssetView,0,void __cdecl(TSharedPtr<FAssetViewItem,0>)>::ExecuteIfSafe() [d:\main\main_stream\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:424]
[2016.08.21-15.49.31:849][589]LogOutputDevice:Error: UE4Editor-ContentBrowser.dll!TBaseDelegate<void,TSharedPtr<FAssetViewItem,0> >::ExecuteIfBound() [d:\main\main_stream\engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:608]
[2016.08.21-15.49.31:850][589]LogOutputDevice:Error: UE4Editor-ContentBrowser.dll!SListView<TSharedPtr<FAssetViewItem,0> >::Private_OnItemDoubleClicked() [d:\main\main_stream\engine\source\runtime\slate\public\widgets\views\slistview.h:718]
[2016.08.21-15.49.31:850][589]LogOutputDevice:Error: UE4Editor-ContentBrowser.dll!STableRow<TSharedPtr<FAssetViewItem,0> >::OnMouseButtonDoubleClick() [d:\main\main_stream\engine\source\runtime\slate\public\widgets\views\stablerow.h:264]
[2016.08.21-15.49.31:851][589]LogOutputDevice:Error: UE4Editor-Slate.dll!<lambda_eeb33fd1b480e3cad58a1531d90d2e14>::operator()() [d:\main\main_stream\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5333]
[2016.08.21-15.49.31:851][589]LogOutputDevice:Error: UE4Editor-Slate.dll!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FPointerEvent,<lambda_eeb33fd1b480e3cad58a1531d90d2e14> >() [d:\main\main_stream\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:215]
[2016.08.21-15.49.31:852][589]LogOutputDevice:Error: UE4Editor-Slate.dll!FSlateApplication::RoutePointerDoubleClickEvent() [d:\main\main_stream\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5331]
[2016.08.21-15.49.31:852][589]LogOutputDevice:Error: UE4Editor-Slate.dll!FSlateApplication::ProcessMouseButtonDoubleClickEvent() [d:\main\main_stream\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5316]
[2016.08.21-15.49.31:853][589]LogOutputDevice:Error: UE4Editor-Slate.dll!FSlateApplication::OnMouseDoubleClick() [d:\main\main_stream\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5294]
[2016.08.21-15.49.31:853][589]LogOutputDevice:Error: UE4Editor-Core.dll!FWindowsApplication::ProcessDeferredMessage() [d:\main\main_stream\engine\source\runtime\core\private\windows\windowsapplication.cpp:1635]
[2016.08.21-15.49.31:854][589]LogOutputDevice:Error: UE4Editor-Core.dll!FWindowsApplication::DeferMessage() [d:\main\main_stream\engine\source\runtime\core\private\windows\windowsapplication.cpp:1977]
[2016.08.21-15.49.31:854][589]LogOutputDevice:Error: UE4Editor-Core.dll!FWindowsApplication::ProcessMessage() [d:\main\main_stream\engine\source\runtime\core\private\windows\windowsapplication.cpp:750]
[2016.08.21-15.49.31:855][589]LogOutputDevice:Error: UE4Editor-Core.dll!FWindowsApplication::AppWndProc() [d:\main\main_stream\engine\source\runtime\core\private\windows\windowsapplication.cpp:672]
[2016.08.21-15.49.31:855][589]LogOutputDevice:Error: USER32.dll
[2016.08.21-15.49.31:855][589]LogOutputDevice:Error: USER32.dll
[2016.08.21-15.49.31:856][589]LogOutputDevice:Error: UE4Editor-Core.dll!FWindowsPlatformMisc::PumpMessages() [d:\main\main_stream\engine\source\runtime\core\private\windows\windowsplatformmisc.cpp:905]
[2016.08.21-15.49.31:856][589]LogOutputDevice:Error: UE4Editor.exe!FEngineLoop::Tick() [d:\main\main_stream\engine\source\runtime\launch\private\launchengineloop.cpp:2795]
[2016.08.21-15.49.31:857][589]LogOutputDevice:Error: UE4Editor.exe!GuardedMain() [d:\main\main_stream\engine\source\runtime\launch\private\launch.cpp:156]
[2016.08.21-15.49.31:857][589]LogOutputDevice:Error: UE4Editor.exe!GuardedMainWrapper() [d:\main\main_stream\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
[2016.08.21-15.49.31:858][589]LogOutputDevice:Error: UE4Editor.exe!WinMain() [d:\main\main_stream\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
[2016.08.21-15.49.31:858][589]LogOutputDevice:Error: UE4Editor.exe!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264]
[2016.08.21-15.49.31:859][589]LogOutputDevice:Error: kernel32.dll
[2016.08.21-15.49.31:859][589]LogOutputDevice:Error: ntdll.dll
[2016.08.21-15.49.31:859][589]LogOutputDevice:Error: ntdll.dll
[2016.08.21-15.49.31:860][589]LogOutputDevice:Error: 

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Backlogged
ComponentTools
Affects Versions4.12.54.134.14
CreatedAug 21, 2016
UpdatedFeb 1, 2019